Patent US4136061A successfully refreshed from Google Patents.
US4136061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous, multiple zone fluidized bed for particle treater
Assignee: Phillips Petroleum Co
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Filing: 1977-12-06
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Granted: 1979-01-23
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Expires: 1997-12-06
Abstract
Abstract A multiple zone apparatus for treating particulate solids and a method for treating particulate solids in seriatim multiple zones are provided. Particulate solids treatment such as the activation of chromium-silica olefin polymerization catalyst is carried out continuously by employing multiple fluidized beds with overflow of solids from one bed to the next lower bed. Each bed has its own source of heat and fluidizing gas to permit step-wise treatment of the particulate solids as particles pass through the system. Temperatures in each zone can be regulated for treatment of the solids in a predetermined manner. In a preferred embodiment each bed is transversely divided with a partition containing a hole sized for forwarding flow from the solids inlet side of the bed to the outlet side without backflow.
Inventors
- 👤 John P. Hogan
- 👤 Donald R. Witt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:17
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/26; B01J8/28; C; C08; C08F; C08F110/00; C08F110/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
187 words
A multiple zone apparatus for contacting particulate solids with treating gas wherein (1) each zone is a chamber comprising: (a) a floor of porosity sufficient to admit fluidizing gas therethrough and to retain thereon the particulate solids to be treated; (b) a means for supplying fluidizing gas through said floor; (c) a means for conducting particulate solids out of said chamber having a port sufficiently above said floor to maintain a level of fluidized particles above said floor; (d) a means for conducting particulate solids into said chamber positioned to discharge at a level lower than the port of said means for conducting particulate solids from said chamber; (e) a means for conducting gases from said chamber, said means for conducting gases having opening above the level of fluidized particulate solids; and (2) said zones arranged for gravity overflow of treated particles from each zone to a next treatment zone with overflow from the apparatus from the last treating zone; and (3) said means for conducting gas arranged to conduct gases to a common collection point without intermingling said gases with fluidized particulate solids in another chamber.
Claim 2
Dependent Claim
187 words
A multiple zone apparatus for contacting particulate solids with treating gas wherein (1) each zone is a chamber comprising: (a) a floor of porosity sufficient to admit fluidizing gas therethrough and to retain thereon the particulate solids to be treated; (b) a means for supplying fluidizing gas through said floor; (c) a means for conducting particulate solids out of said chamber having a port sufficiently above said floor to maintain a level of fluidized particles above said floor; (d) a means for conducting particulate solids into said chamber positioned to discharge at a level lower than the port of said means for conducting particulate solids from said chamber; (e) a means for conducting gases from said chamber, said means for conducting gases having opening above the level of fluidized particulate solids; and (2) said zones arranged for gravity overflow of treated particles from each zone to a next treatment zone with overflow from the apparatus from the last treating zone; and (3) said means for conducting gas arranged to conduct gases to a common collection point without intermingling said gases with fluidized particulate solids in another chamber.
Claim 3
Dependent Claim
16 words
An apparatus of claim 1 wherein there is means for controlling the temperature of each chamber.
Claim 4
Dependent Claim
25 words
An apparatus of claim 1 wherein there is means for recovering entrained solids from said gases with return of recovered solids to a treatment zone.
Claim 5
Dependent Claim
47 words
A method for contacting particulate solids with treating gas wherein said particulate solids are passed through a multiple zone apparatus of claim 1 with gravity overflow of treated particles from each zone to a next treatment zone with overflow from the last treating zone being treated product.
Claim 6
Dependent Claim
14 words
A method of claim 1 wherein the temperature of each chamber is individually controlled.
Claim 7
Dependent Claim
20 words
A method of claim 5 wherein the temperature of each chamber is controlled by individual heating means for each chamber.
Claim 8
Dependent Claim
19 words
A method of claim 5 wherein means for controlling the temperature comprises a means for preheating said treating gas.
Claim 9
Dependent Claim
12 words
A method of claim 4 wherein said particulate solids are polymerization catalysts.
Claim 10
Dependent Claim
12 words
A method of claim 8 wherein said catalysts are ethylene polymerization catalysts.
Claim 11
Dependent Claim
35 words
A method of claim 9 wherein said ethylene polymerization catalysts comprise (1) a chromium compound and (2) silica or a silica admixed with up to about 20 weight percent of one or more metal oxides.
Claim 12
Dependent Claim
67 words
An apparatus of claim 1 wherein each zone is a chamber additionally comprising (f) a partition transversely dividing the chamber into a first side and a second side, said partition of height greater than the fluidized bed contained in the chamber and solidly extending across the chamber to prevent flow between said first side and said second side except through a transfer hole located in said partition.
Claim 13
Dependent Claim
33 words
An apparatus of claim 11 wherein the transfer hole is sized to permit a maximum flow from the first side of the partition to the second side of the partition with minimum backflow.
Claim 14
Dependent Claim
27 words
An apparatus of claim 12 wherein the particle transfer hole is sized within the range of about 0.008 to about 0.025 times the diameter of the chamber.
Claim 15
Dependent Claim
47 words
A method for contacting particulate solids with treating gas wherein said particulate solids are passed through a multiple zone apparatus of claim 11 with gravity overflow of treated particles from each zone to the next treatment zone with overflow from the last treating zone being treated product.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |